Jerry and Nick leave the travel agency without paying for the tickets.
After Gabriela rescues Jerry from of the pool, her hair is completely dry in seconds.
When Jerry and Nick enter their cabin from the hallway, they have passed by the first set of cabins at the end of the hallway. Hector enters their room from the opposite direction, demonstrating that they are in a cabin with cabins on each side. The cabin map on the door of their cabin shows them to be in an end cabin on the other side of the hallway.
When Jerry parachutes onto the cruise ship, the ship is moving. When he lands and hops up, its obvious the ship is docked.
When Jerry is dancing on stage and his girlfriend shows up, his chain with a giant gold dollar sign appears and disappears between shots.
In the end of the movie when character Nick travels to Sweden looking for Inga, the location he travels to is meant to be Sweden but is in fact Switzerland. The outdoor shot are the Swiss alps and Inga's family is wearing traditional Swiss/German clothes, for example her father wears lederhosen.
After buying the cruise tickets in Philadelphia the next shot Jerry and Nick are in Europe. The evidence of this is the plate on the cab and the surrounding area.
In the bar Sanz's character refers to Roger Moore's character, Lloyd, as Roger.